The boys don’t know ___________. A. how do they swim B. how swim C. they how swim D. how to swim
2022-12-09 13:31:15 137次 2014-2015学年四川开江永兴中学九年级上学期12月月考英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
The boys don’t know ___________.
A. how do they swim
B. how swim
C. they how swim
D. how to swim
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